遍历 Windows 系统账户信息

#include "stdafx.h"
#include "Ntsecapi.h"

DWORD GetStrWithPSID(PSID pSid, TCHAR* szBuffer, int nLength);

int _tmain(int argc, _TCHAR* argv[])
{
    PLUID       pSessions; 
    NTSTATUS    ntStatus;  
    ULONG       ulCount = 0;

    // 枚举所有账户信息
    ntStatus = LsaEnumerateLogonSessions(&ulCount, &pSessions);
    for (ULONG i = 0; i < ulCount; i++)
    {
        // 取出一个账户信息到 pSessionData，该函数在内部分配内存
        PSECURITY_LOGON_SESSION_DATA pSessionData = NULL;
        ntStatus = LsaGetLogonSessionData (&pSessions[i], &pSessionData);
        if (0 != ntStatus)
        {
            if (pSessionData)
            {
                LsaFreeReturnBuffer(pSessionData);
            }

            continue;
        }

        // 验证 SID 是否有效
        if (pSessionData && IsValidSid(pSessionData->Sid))
        {
            TCHAR szUserName[MAX_PATH] = {0};
            TCHAR szSID[MAX_PATH] = {0};

            // 拷贝并打印用户名信息，该结构体中有很多成员，描述了该账户的属性
            if (NULL != pSessionData->UserName.Buffer)
            {
                ZeroMemory(szUserName, MAX_PATH);
                CopyMemory(szUserName, pSessionData->UserName.Buffer, pSessionData->UserName.Length);
                wcout << szUserName << _T(" -> ");
                GetStrWithPSID(pSessionData->Sid, szSID, MAX_PATH);
                wcout << szSID << endl;
            }
        }

        // 释放资源
        if (NULL != pSessionData)
        {
            LsaFreeReturnBuffer(pSessionData);
        }
    }

    getchar();
    return 0;
}

DWORD GetStrWithPSID(PSID pSid, TCHAR* szBuffer, int nLength)
{
    // convert SID to string
    SID_IDENTIFIER_AUTHORITY *psia = ::GetSidIdentifierAuthority(pSid);
    DWORD dwTopAuthority = psia->Value[5];
    _stprintf_s(szBuffer, nLength, _T("S-1-%lu"), dwTopAuthority);

    TCHAR szTemp[32];
    int iSubAuthorityCount = *(GetSidSubAuthorityCount(pSid));
    for (int i = 0; i < iSubAuthorityCount; i++)
    {
        DWORD dwSubAuthority = *(GetSidSubAuthority(pSid, i));
        _stprintf_s(szTemp, 32, _T("%lu"), dwSubAuthority);
        _tcscat_s(szBuffer, nLength, _T("-"));
        _tcscat_s(szBuffer, nLength, szTemp);
    }

    return 0;
}